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      <a href="/2016/07/16/angular-note-5-fullfill-index/" title="Angular使用笔记5--作用域简单分析以及制作index页面" itemprop="url">Angular使用笔记5--作用域简单分析以及制作index页面</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2016-07-16T00:49:21.000Z" itemprop="datePublished">2016-07-16</time>
    更新日期:<time datetime="2018-12-18T15:28:34.169Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#有关angularJS作用域"><span class="toc-number">1.</span> <span class="toc-text">有关angularJS作用域</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#rootscope相关执行过程"><span class="toc-number">1.1.</span> <span class="toc-text">rootscope相关执行过程</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Scope对象"><span class="toc-number">1.2.</span> <span class="toc-text">Scope对象</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#监控对象属性"><span class="toc-number">1.3.</span> <span class="toc-text">监控对象属性</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#作用域树"><span class="toc-number">1.4.</span> <span class="toc-text">作用域树</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">1.5.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#制作index页面"><span class="toc-number">2.</span> <span class="toc-text">制作index页面</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#添加index控制器"><span class="toc-number">2.1.</span> <span class="toc-text">添加index控制器</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加侧边菜单"><span class="toc-number">2.2.</span> <span class="toc-text">添加侧边菜单</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加页面内容"><span class="toc-number">2.3.</span> <span class="toc-text">添加页面内容</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#控制器逻辑"><span class="toc-number">2.4.</span> <span class="toc-text">控制器逻辑</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近的一个项目使用AngularJS(v1.2.6)作为前端的框架，《Angular使用笔记》系列用于记录过程中的一些使用和解决方法。<br>本文记录简单介绍作用域，以及制作首页的过程。<br><a id="more"></a></p>
<h2 id="有关angularJS作用域"><a href="#有关angularJS作用域" class="headerlink" title="有关angularJS作用域"></a>有关angularJS作用域</h2><hr>
<h3 id="rootscope相关执行过程"><a href="#rootscope相关执行过程" class="headerlink" title="rootscope相关执行过程"></a>rootscope相关执行过程</h3><ul>
<li>调用compile(element)(scope)</li>
<li>开始编译dom树，传递的element是应用的根节点（有ng-app属性的节点或者手动bootstrap的节点）</li>
<li>传递的scope则是唯一的根作用域rootscope，与根节点对应</li>
<li>通过scope.$apply(..)进行digest进行脏检查，开始一些初始化工作</li>
</ul>
<h3 id="Scope对象"><a href="#Scope对象" class="headerlink" title="Scope对象"></a>Scope对象</h3><ul>
<li>简单的JavaScript对象</li>
<li>可以像对其他对象一样添加属性</li>
<li>Scope对象是用构造函数创建的</li>
<li>从原型方法包括$watch，$apply和$digest方法，以及处理自定义事件（消息传递）的$on, $emit和$broadcaset方法</li>
</ul>
<h3 id="监控对象属性"><a href="#监控对象属性" class="headerlink" title="监控对象属性"></a>监控对象属性</h3><ul>
<li><p>$watch方法</p>
<ul>
<li>$watch方法监听作用域变化</li>
<li>$watch函数所做的工作其实就是作用域中变量和关联的监听函数的存储</li>
<li>$watch指定如下两个函数，就可以创建一个监听器<ul>
<li>一个监控函数，用于指定所关注的那部分数据。</li>
<li>一个监听函数，用于在数据变更的时候接受提示</li>
</ul>
</li>
</ul>
</li>
<li><p>$digest方法</p>
<ul>
<li>$digest方法进行脏检查，它执行了所有在作用域上注册过的监听器</li>
<li>当作用域里的变量发生变化时，调用$digest方法便会执行该作用域以及它的所有子作用域上的相关的监听函数</li>
<li>$digest函数的作用是调用这个监控函数，并且比较它返回的值和上一次返回值的差异</li>
<li>如果不相同，监听器就是脏的，它的监听函数就应当被调用</li>
<li>内置的directive和controller内部都已经做了$apply操作</li>
</ul>
</li>
<li><p>$eval方法</p>
<ul>
<li>$eval在作用域的上下文上执行代码</li>
<li>使用一个函数作参数，所做的事情是立即执行这个传入的函数，并且把作用域自身当作参数传递给它，返回的是这个函数的返回值</li>
</ul>
</li>
<li><p>$apply方法</p>
<ul>
<li>使用一个函数作参数，用$eval执行这个函数，然后通过$digest触发digest循环</li>
<li>在$apply中，$digest的调用放置于finally块中，以确保即使函数抛出异常，也会执行digest</li>
</ul>
</li>
</ul>
<h3 id="作用域树"><a href="#作用域树" class="headerlink" title="作用域树"></a>作用域树</h3><ul>
<li>普通的作用域通过原型链实现了继承关系，孤立作用域没有任何继承关系</li>
<li>所有的作用域之间（也包括孤立作用域）根据自身所处的位置都存在以下这些关系<ul>
<li>$root来访问跟作用域</li>
<li>$parent来访问父作用域</li>
<li>$childHead（$childTail）访问头（尾）子作用域</li>
<li>prevSibling（$nextSibling）访问前（后）一个兄弟作用域</li>
</ul>
</li>
</ul>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><ul>
<li><a href="http://www.ituring.com.cn/article/39865" target="_blank" rel="external">《构建自己的AngularJS，第一部分：作用域和digest》</a></li>
<li><a href="http://www.html-js.com/article/2365" target="_blank" rel="external">《angularjs1.3.0源码解析之scope》</a></li>
</ul>
<h2 id="制作index页面"><a href="#制作index页面" class="headerlink" title="制作index页面"></a>制作index页面</h2><hr>
<p>页面结构如下：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/F3A2.tmp.png" alt="image"></p>
<h3 id="添加index控制器"><a href="#添加index控制器" class="headerlink" title="添加index控制器"></a>添加index控制器</h3><ul>
<li>在scripts文件夹内添加一个indexCtrl.js文件，并添加控制器</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">app.controller(<span class="string">'IndexCtrl'</span>, [<span class="string">'$scope'</span>,<span class="function"><span class="keyword">function</span>(<span class="params">$scope</span>) </span>&#123;&#125;]);</div></pre></td></tr></table></figure>
<ul>
<li>在app.js文件中对应路由添加上控制器</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">.when(<span class="string">'/index'</span>, &#123;</div><div class="line">  <span class="attr">templateUrl</span>: <span class="string">'views/index.html'</span>, <span class="comment">//index的html页面</span></div><div class="line">  controller: <span class="string">'IndexCtrl'</span> <span class="comment">//index的控制器，现在暂时不加</span></div><div class="line">&#125;)</div></pre></td></tr></table></figure>
<ul>
<li>在index.html页面内引入indexCtrl.js文件</li>
</ul>
<h3 id="添加侧边菜单"><a href="#添加侧边菜单" class="headerlink" title="添加侧边菜单"></a>添加侧边菜单</h3><ul>
<li>使用bootstrap的列表组作为侧边菜单</li>
<li>使用bootstrap的Collapse插件实现展开和收缩菜单</li>
<li>菜单使用ng-repeat遍历生成，故需在控制器中加入相关的内容使其生成相应菜单，此处使用scope.asidemenus</li>
</ul>
<h3 id="添加页面内容"><a href="#添加页面内容" class="headerlink" title="添加页面内容"></a>添加页面内容</h3><ul>
<li>在index页面中添加页面内容</li>
<li>使用统一样式添加页面内容</li>
<li>使用scope.loading设置当前内容</li>
<li>使用ng-show绑定scope.loading设置相应显示内容</li>
<li>使用ng-click绑定菜单事件，改变scope.loading来实现内容切换</li>
</ul>
<h3 id="控制器逻辑"><a href="#控制器逻辑" class="headerlink" title="控制器逻辑"></a>控制器逻辑</h3><ul>
<li>使用$scope.loading储存当前位置</li>
<li>使用$scope.asidemenus储存侧边菜单，包括以下参数<ul>
<li>title: string，一级菜单的名称</li>
<li>click: function对象，点击菜单时绑定的事件</li>
<li>menus: obj对象，一级菜单下的二级菜单<ul>
<li>title: string，二级菜单的名称</li>
<li>click: function对象，点击菜单时绑定的事件<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line">app.controller(<span class="string">'IndexCtrl'</span>, [<span class="string">'$scope'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">$scope</span>) </span>&#123;</div><div class="line">  $scope.loading = <span class="string">'init'</span>; <span class="comment">//$scope.loading储存当前位置</span></div><div class="line">  $scope.asidemenus = [&#123;</div><div class="line">    <span class="attr">title</span>: <span class="string">''</span>, <span class="comment">//一级菜单的名称</span></div><div class="line">    click: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;&#125;, <span class="comment">//点击菜单时绑定的事件</span></div><div class="line">    menus: [&#123; <span class="comment">//二级菜单</span></div><div class="line">      text: <span class="string">''</span>, <span class="comment">//二级菜单的名称</span></div><div class="line">      click: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;&#125; <span class="comment">//点击菜单时绑定的事件</span></div><div class="line">    &#125;]</div><div class="line">  &#125;];</div><div class="line">&#125;]);</div></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>AngularJS中用得最爽的莫过于模板引擎的数据和事件绑定了，当你熟悉了angular之后你会喜欢上他的哦。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/angular-notes/5-fullfill-index" target="_blank" rel="external">此处查看项目代码（仅包含app部分）</a><br><a href="http://angular-notes.godbasin.com/5-fullfill-index/index.html#/index" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">
			查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a>
			<br>
			更欢迎来<a href="https://godbasin.github.io/front-end-playground">被删的前端游乐场</a>边撸猫边学前端噢
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	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#有关angularJS作用域"><span class="toc-number">1.</span> <span class="toc-text">有关angularJS作用域</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#rootscope相关执行过程"><span class="toc-number">1.1.</span> <span class="toc-text">rootscope相关执行过程</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Scope对象"><span class="toc-number">1.2.</span> <span class="toc-text">Scope对象</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#监控对象属性"><span class="toc-number">1.3.</span> <span class="toc-text">监控对象属性</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#作用域树"><span class="toc-number">1.4.</span> <span class="toc-text">作用域树</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">1.5.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#制作index页面"><span class="toc-number">2.</span> <span class="toc-text">制作index页面</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#添加index控制器"><span class="toc-number">2.1.</span> <span class="toc-text">添加index控制器</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加侧边菜单"><span class="toc-number">2.2.</span> <span class="toc-text">添加侧边菜单</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加页面内容"><span class="toc-number">2.3.</span> <span class="toc-text">添加页面内容</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#控制器逻辑"><span class="toc-number">2.4.</span> <span class="toc-text">控制器逻辑</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
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